This idea is to raise funds to set up an aquaponics and greens systems to grow fish and salad greens and sell them to local residents, restaurants and/or food retailers. There are now a range of great books on how to set up an aquaponics system, the most popular of which is Aquaponic Gardening by Sylvia Bernstein. Click here to see a range of books on this topic: https://www.chapters.indigo.ca/en-ca/home/search/?keywords=aquaponic%20gardening
A social enterprise in the United Kingdom successfully raised the equivalent of about $27,000 CAN to fund an aquaponic urban farm in a used shipping container. You can view their campaign here: https://www.kickstarter.com/projects/katehofman/growup-an-aquaponic-urban-farm-for-london/description
This idea could be funded as a rewards project where backers receive free fish and/or free micro-greens in return for their contribution.